Tool chuck for welding



Nov. 3, 1931. s, EVANS 1,830,649'

TOOL CHUCK FOR WELDING Filed July 5, 1928 y *27 4 will will* M @xfa/22d f/vI/ENTO/e ATTORNEY Patented Nov. 3, 1931 UNITED s'rATEs SETH EVAS, E HOUSTON,`TEXASQASSIGNORTO HUGE-IES' T0013 GMPANY, OF HO'IISlOl", l

@1F-FICE i TEXAS, A CORPORATION 0F TEXAS '11001.k cHUoK4 Fon.- wELDlNG Y Application `filed. July 5,

Y Myinvention relatesto chucks for holding tools particularly during operations for welding connected Withpsaid tools.

- Itis an object of the invention toprovide a chuck which will grip and` retain the tool duringthe welding operation in a simple and effective manner and which will also-force said tool into close contact with the body of the device. f

It is desired to provide a chuck for operation by means of a pressure fluid which will be automatically expanded and moved inwardly as the fluid pressure is employed, and which will automatically release when the fluid pressure is cut olf. Y

, It is also an object to provide a chuck adapted to interfit with the tool so that when the tool is gripped, it will be drawn into close contact with the body of the chuck, allowing free passage of an electric current from the chuck to the tool.

Referring to the drawing herewith, I have shown .a side view partly in elevation and partly in central longitudinal section illustrating the construction of the chuck with the tool thereon.

In constructing the chuck, I employ a body l which is preferably of a conducting metal offering but small resistance to the passage of electric current. This body is approximately cylindrical in outline, the forward end of the same having a raised portion 2, thus providing a shoulder 3 against which a ring -lof conducting material may abut.

The forward end of the chuck is provided with a seat 5 to receive the face of the tool 6 which is to be gripped by the chuck. In the present instance, a tool is shown having an approximately frusto-conical shape, the face of which is beveled at 7 The seat 5 is shaped toV receive the beveled face ofthe cone 6, the forward face of the chuck having a ridge 31' projecting therefrom, the inner face of which forms the seat as described.

The interior ofthe chuck l is formed with a chamber 8 which has a partition 9 at the rearward side thereof separating it from a smaller chamber 10 at the'rear. 'lVithin the chamber 9v is a clutch sleeve 11 adapted to slide upon the central core or mandrel 12. Its

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inner end has a flange 13 projecting inwardly to bear "upon theV coreor guide axially of the chuck The sleeve'has lat its forward end, a radially extending flange i4. which* has a flattened forward face to lit against the cone 6 and has its peripheryformed with a pro* jecti-nglip l5 which is extended to engage Within a groove 16 inthe cone whensaid flange is expandedv to thereby grip said cone and force said conc inwardly. The sleeve l1 is slotted at VVlfromV thein-ner end forwardly to and including the flanged portion 14, thus providing a fle'Xibilityi-n the sleeve.

The forward inner side of the sleeve ifs beveled at 18 to contact with a beveled expanding Vmember 1,9.l The sleeve ll is held normally forward. out of grippingpositionfby a spring 34 bearing at one end against the partition 9.

The guide core l2 is threaded at its for-V Y ward end to engagefwith the beveled eXpandf ing ring 19,thus rmaking the said expanding ring adjustable longitudinally thereon. The Y opposite end of theV guide core is connected at 20 within a' plug 2l which projects rea-r-y wardly beyond the end .of the chuck body l. The plug 2l has its outer end recessed cen'- trally to receive anipple 22. Said nipple is of tubular construction fitting within the end of theplug. It has a radial flange 23 which is separated from the inner end of the recess N by packing material 24. The nipple is; held in place by a tubular nut 25 which tends to hold the nipple in place and is separatedfrom the flange 23 by a Washer 26. The nipple 22' is tubular, having itsvout'er end threadedV for connection with a pressure line 'through which fluidunder pressure may be employed. .The inner end thereof connects with the passage 27 leading to a radial duct 28 which connects with a chamber 29 within a pressure cylinder 30. The outer wall of the cylinder comprises a plate attached to the cylinder by screws and making a `loose fit at 32 about the plug 2l whereby fluid may find n the piston 33 is movedv sure to move Vsaid plu-ganci core.

and is adapted to be acted upon by fluid pres# *t In operation the tool 6 is placed over the forward end of the sleeve at 14 and fluid pressure is admitted to the chamber 29 to Y move the piston rearwardly. vThis will first move the ring 19 against the sleeve 11 expanding the flange 14 and gripping the tool. The tool is then drawn tightly into itsseat 5 so as to make a close electrical contact with the body of the chuck. The current may then pass through the conductor 35 to the ring 4 and the body 1 to the tool which forms a terminal in welding cutting teeth upon said tool.. When the fluid pressure is released the spring 34 acts to force said core 12 forwardly thereby allowing the sleevell to retract the saidcore to force said ring within said sleeve to expandsaid sleeve into engagement with said tool, and to` force .said tool tightly into p said seat. a Y Y 2. A tool-engaging chuckincluding a body having a tool receiving seat thereoman axial guide core, a-sleeve `onsaid core having a radial tool-engaging flange thereon, a beveled expanding ring on said core, adapted to lit Within saidsleeve and fluid pressure operated means to move said core inwardly to force said sleeve to grip said tool and move it tightly into said seat,`and means to move said core to release said tool whenv said fluid pressure operated means is inoperative. v l 1 A 1 3. A tool-engaging chuck includinga tubular body having' a forward seat at its forward end, an axial core in said body, means to move said core inwardly,.a sleeve slidable on said core, a flange on said sleeve adapted to be expanded to grip said tool, and means on said core, operative when saidcore is moved inwardly to expand said sleeve to gripl said tool, and move it into said seat, and separate means *to force said sleeve outwardly when said core is released. i

4. A tool-engaging chuck including a `body having a forward seat thereon, a central core in said body, altool-engaging sleeve on said core, means on said core to expand said sleeve to engage said tool and to simultaneously move lsaid sleeve inwardly, and means to release said sleeve and said tool.

A tool engaging chuck including a tuend thereof, forming a seat, a central core in expand said tool engaging means, and move the work into said seat. Y

6. A tool engaging chuck including a tubular body, an annular seat on said body, a core in said body,'an expansible sleeve slidable on said core toengagethe work, means to movesaid lcore to'expand said sleeve to engage the work, the movement of said core acting also to move the work into said seat.

7. Atool engaging chuck including a tu-y bularbody,` an vannular seat on said body, a core 1n said body, an expansible sleeve slidable on said' core to engage the work, means to move said core to expand said sleeve to engage the work, the'movement of said core actingY also to move the work `into saidseat,

and means to move said sleeve intolretracted position to release thefwork. l

Inztestimony whereof I hereunto aiix my signature this 2nd day of July'A.D.-1928.AV f .SETHKEVANS said body, means .slidable on said core toen- I gage the tool, and' means'to move said core to 

